GB698054A - Improvements in circuits for use in telephone systems - Google Patents

Improvements in circuits for use in telephone systems

Info

Publication number
GB698054A
GB698054A GB6161/51A GB616151A GB698054A GB 698054 A GB698054 A GB 698054A GB 6161/51 A GB6161/51 A GB 6161/51A GB 616151 A GB616151 A GB 616151A GB 698054 A GB698054 A GB 698054A
Authority
GB
United Kingdom
Prior art keywords
filter
signal
frequencies
potential
grid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB6161/51A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB698054A publication Critical patent/GB698054A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Selective Calling Equipment (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB6161/51A 1950-03-17 1951-03-14 Improvements in circuits for use in telephone systems Expired GB698054A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL291949X 1950-03-17

Publications (1)

Publication Number Publication Date
GB698054A true GB698054A (en) 1953-10-07

Family

ID=19782799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6161/51A Expired GB698054A (en) 1950-03-17 1951-03-14 Improvements in circuits for use in telephone systems

Country Status (6)

Country Link
US (1) US2654002A (it)
BE (1) BE501904A (it)
CH (1) CH291949A (it)
FR (1) FR1034010A (it)
GB (1) GB698054A (it)
NL (1) NL80725C (it)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE514053A (it) * 1951-09-10
US2826638A (en) * 1952-04-26 1958-03-11 Bell Telephone Labor Inc Signaling system
US2749390A (en) * 1952-12-02 1956-06-05 Itt Ringing circuit for telephone line and radio order wire
FR1096496A (fr) * 1953-12-16 1955-06-21 Lignes Telegraph Telephon Dispositif récepteur sélectif pour signaux d'appel pour systemes de télécommunication
FR1096599A (fr) * 1953-12-22 1955-06-22 Lignes Telegraph Telephon Dispositif comportant des éléments non linéaires associés à des circuits sélectifs
US2806903A (en) * 1954-03-24 1957-09-17 Int Standard Electric Corp Voice frequency signal receivers
US2957950A (en) * 1954-11-18 1960-10-25 Bell Telephone Labor Inc Transistor selective ringing circuit
US2931956A (en) * 1956-02-06 1960-04-05 Elliott & Evans Inc Regenerative radio receiver for remotely controlled relay
US3087999A (en) * 1959-12-08 1963-04-30 Motorola Inc Mobile dialing system
US3143602A (en) * 1961-05-19 1964-08-04 Bell Telephone Labor Inc Multifrequency signal receiver
US3341815A (en) * 1962-12-31 1967-09-12 Bunker Ramo Frequency responsive receiving system with noise prevention

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE347704A (it) * 1927-01-04
US1711651A (en) * 1927-01-29 1929-05-07 Bell Telephone Labor Inc Signaling system
US2145053A (en) * 1936-11-18 1939-01-24 Bell Telephone Labor Inc Signaling system
US2282131A (en) * 1940-01-12 1942-05-05 Associated Electric Lab Inc Electrical signaling system
GB541731A (en) * 1940-06-07 1941-12-09 Telephone Mfg Co Ltd Improvements in and relating to telephone and like systems
US2293869A (en) * 1940-09-14 1942-08-25 Bell Telephone Labor Inc Signaling system

Also Published As

Publication number Publication date
US2654002A (en) 1953-09-29
CH291949A (de) 1953-07-15
NL80725C (it)
BE501904A (it)
FR1034010A (fr) 1953-07-17

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